yupc123@163.com

IF(CLK'EVENT AND CLK='1')THEN IF (A'EVENT AND A='1') then 以上两条语句逻辑上有错 应改为: if clk'event and clk='1' then arf <=arf-1; end if if a'event and a='1' then if clk='1' then arf <= data; end if; end if;